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• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

静态 Atomics .wait() method verifies that a given position in an Int32Array still contains a given value and if so sleeps, awaiting a wakeup or a timeout. It returns a string which is either " ok ", " not-equal ", or " timed-out ".

注意： This operation only works with a shared Int32Array and may not be allowed on the main thread.

句法

Atomics.wait(typedArray, index, value[, timeout])
					

参数

typedArray

A shared Int32Array .

index

The position in the typedArray to wait on.

value

The expected value to test.

timeout 可选

Time to wait in milliseconds. Infinity , if no time is provided.

返回值

A String which is either " ok ", " not-equal ", or " timed-out ".

异常

• 抛出 TypeError , if typedArray is not a shared Int32Array .
• 抛出 RangeError , if index is out of bounds in the typedArray .

范例

Using wait()

Given a shared Int32Array :

const sab = new SharedArrayBuffer(1024);
const int32 = new Int32Array(sab);
					

A reading thread is sleeping and waiting on location 0 which is expected to be 0. As long as that is true, it will not go on. However, once the writing thread has stored a new value, it will be notified by the writing thread and return the new value (123).

Atomics.wait(int32, 0, 0);
console.log(int32[0]); // 123
					

A writing thread stores a new value and notifies the waiting thread once it has written:

console.log(int32[0]); // 0;
Atomics.store(int32, 0, 123);
Atomics.notify(int32, 0, 1);
					

规范

规范
ECMAScript (ECMA-262) The definition of 'Atomics.wait' in that specification.

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
wait	Chrome 68 68 不支持 60 — 63 Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks . This was a temporary removal while mitigations were put in place.	Edge 79 79 不支持 16 — 17 Support was removed to mitigate speculative execution side-channel attacks (Windows blog) .	Firefox 78 78 57 Disabled Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog) . Disabled From version 57: this feature is behind the javascript.options.shared_memory preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 不支持 55 — 57 不支持 48 — 55 Disabled Disabled From version 48 until version 55 (exclusive): this feature is behind the javascript.options.shared_memory preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 不支持 46 — 48 Alternate Name Disabled The method returns values Atomics.OK , Atomics.TIMEDOUT ，和 Atomics.NOTEQUAL , instead of the later-specified strings. Alternate Name Uses the non-standard name: futexWait Disabled ). To change preferences in Firefox, visit about:config.	IE No	Opera No	Safari 10.1 — 11.1	WebView Android 60 — 63 不支持 60 — 63 Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks . This is intended as a temporary measure until other mitigations are in place.	Chrome Android 60 — 63 不支持 60 — 63 Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks . This is intended as a temporary measure until other mitigations are in place.	Firefox Android 57 Disabled 57 Disabled Support was disabled by default to mitigate speculative execution side-channel attacks (Mozilla Security Blog) . Disabled From version 57: this feature is behind the javascript.options.shared_memory preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 不支持 55 — 57 不支持 48 — 55 Disabled Disabled From version 48 until version 55 (exclusive): this feature is behind the javascript.options.shared_memory preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 不支持 46 — 48 Alternate Name Disabled The method returns values Atomics.OK , Atomics.TIMEDOUT ，和 Atomics.NOTEQUAL , instead of the later-specified strings. Alternate Name Uses the non-standard name: futexWait Disabled ). To change preferences in Firefox, visit about:config.	Opera Android No	Safari iOS 10.3 — 11.3	Samsung Internet Android No 不支持 No Chrome disabled SharedArrayBuffer on January 5, 2018 to help reduce the efficacy of speculative side-channel attacks . This is intended as a temporary measure until other mitigations are in place.	nodejs 8.10.0

图例

完整支持

完整支持

不支持

不支持

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

使用非标名称。

另请参阅

• Atomics
• Atomics.notify()

元数据

• 最后修改： May 20, 2020

相关话题

1. 标准内置对象
2. Atomics
3. 方法
   1. Atomics.add()
   2. Atomics.and()
   3. Atomics.compareExchange()
   4. Atomics.exchange()
   5. Atomics.isLockFree()
   6. Atomics.load()
   7. Atomics.notify()
   8. Atomics.or()
   9. Atomics.store()
   10. Atomics.sub()
   11. Atomics.wait()
   12. Atomics.xor()
4. 继承：
5. Object
6. 特性
   1. Object.prototype.__proto__
   2. Object.prototype.constructor
7. 方法
   1. Object.prototype.__defineGetter__()
   2. Object.prototype.__defineSetter__()
   3. Object.prototype.__lookupGetter__()
   4. Object.prototype.__lookupSetter__()
   5. Object.prototype.hasOwnProperty()
   6. Object.prototype.isPrototypeOf()
   7. Object.prototype.propertyIsEnumerable()
   8. Object.prototype.toLocaleString()
   9. Object.prototype.toSource()
   10. Object.prototype.toString()
   11. Object.prototype.valueOf()
   12. Object.setPrototypeOf()